Early computers

Brass, Glass and Wood: The Fine Art of Technology - includes a part of SILLIAC, The University of Sydney's first computer and one of the first in Australia, part of the collection at the Macleay Museum, scroll down to see image
http://www.usyd.edu.au/su/macleay/cbrgl&wd.htm

Electronics Tutorials, Free - from Williamson's Labs, scroll down to Technology then click on Digital Logic link at left of screen.
http://www.williamson-labs.com/

Electronic Projects Online - contains 31 magazine which have been published in various UK electronics magazines, includes background information, circuit diagrams and map of circuit board, from The Electrical Engineering Homepage
http://www.web-ee.com/index.htm